National Gravity Compilation 2019 Tilt Image for Australia

A 2019 gravity anomaly grid derived from approximately 1.8 million ground and offshore gravity observations. The processed data, checked for quality by GA geophysicists, reveals sub-surface geological structure. Observations were collected by government, industry, and research organizations from the 1940s to 2019.

Use Cases

• Modeling sub-surface geological density variations based on gravity anomaly data.
• Mapping continental-scale geological structures based on the processed tilt-filtered grid.
• Integrating ground and offshore gravity data for continental margin studies based on the combined ANGD and Scripps data.
• Assessing terrain corrections for gravity surveys based on the use of bathymetry and topography data.

Strengths

• Derived from approximately 1.8 million gravity observations, with nearly 1.4 million stations from the ANGD used.
• Grid has a cell size of 0.00417 degrees (approximately 435m), providing a specific spatial resolution.
• Data quality was checked by GA geophysicists, indicating a formal review process.
• Station spacing varies from 11 km to less than 1 km, with major parts of the continent between 2.5 and 7 km, describing measurement density.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Last updated 2026-05-05 02:19:13.816452; freshness should be verified.

Provenance

Source

Australian Ocean Data Network, incorporating data from the Australian National Gravity Database and Scripps Institution of Oceanography.

Collection Method

Ground observations processed via standard methods and combined with offshore data from a global gravity grid.

Time Range

Observations from the 1940s to September 2019.

Geography

Australia and its continental margins.